PHPackages                             i4h/php-mip - PHPackages - PHPackages  [Skip to content](#main-content)[PHPackages](/)[Directory](/)[Categories](/categories)[Trending](/trending)[Leaderboard](/leaderboard)[Changelog](/changelog)[Analyze](/analyze)[Collections](/collections)[Log in](/login)[Sign up](/register)

1. [Directory](/)
2. /
3. i4h/php-mip

ActiveLibrary

i4h/php-mip
===========

A PHP Class to Create and Output Mixed-Integer Programs

07PHP

Since Feb 7Pushed 9y ago1 watchersCompare

[ Source](https://github.com/i4h/PhpMIP)[ Packagist](https://packagist.org/packages/i4h/php-mip)[ RSS](/packages/i4h-php-mip/feed)WikiDiscussions master Synced 2mo ago

READMEChangelogDependenciesVersions (1)Used By (0)

PhpMIP
======

[](#phpmip)

PhpMIP is a PHP class representing a Linear Mixed-Integer Programm.

It comes with a writer to the IBM CPLEX LP file format and a base writer and Interface that should facilitate adding your own writer classes.

Installation
============

[](#installation)

The package can be installed into your project via composer:

```
 $ php composer.phar require i4h/php-mip "*"

```

Usage
=====

[](#usage)

See the examples directory for two examples MIPs.

The workflow follows that of common modeling languages:

- Create sets
- Create variables
- Create constraints
- Define the objective function

This is the example from `example/trivial.php`:

```
$mip = new \vendor\i4h\PhpMIP\MIP();

/* Variable x */
$mip->addVariable("x", \vendor\i4h\PhpMIP\MIPvariable::TYPE_CONTINUOUS);
$mip->setVariableLB("x", 0);

/* Variable y */
$mip->addVariable("y", \vendor\i4h\PhpMIP\MIPvariable::TYPE_CONTINUOUS);
$mip->setVariableLB("y", 0);

/* Objective (default coefficient is 1) */
$mip->addObjectiveCoefficient("x");
$mip->addObjectiveCoefficient("y");

/* Constraint x + y 'x', 'coefficient'=>1],
    ['name'=>'y', 'coefficient'=>1],
];
$mip->addConstraintLE($vars, 1);

/* Use Lp writer to write to a file */
$writer = new \vendor\i4h\PhpMIP\LpWriter();
$writer->setOutFile("/path/to/outfile.lp");
$writer->write(create);

```

The code above will create an lp file with the following content:

```
Minimize
obj: 1 x + 1 y
Subject To
1 x + 1 y